Internal-combustion engine



Dec. 2%, 1922. 1,44@,l50

c. H. HUTCHINSON.

INTERNAL COMBUSTION ENGINE.

FILED F55. 2, I920.

Serial No. 3415713.

Patented lil es. 236 M92321 tint i oennntron rnroninson, ori'rreno'vnn,

MASZQAOHUSETTS.

"INTEEIil'AL-COME SUTTON ENGINE.

Application filed. fiehruarj fi, 192G. Serial No. 355,655.

l r 0 all whom it may concern. Be 1t known that I CARLETON siding at- Hanover, county. of Pi )n'th, State of Massachusetts. have inventedo. certain ne 1 and useful Improvement in nal-tlon1hustion Engines of which the lowing is a specification, reference hei had therein to theaccoinpan' ing drawi The invention relates to a new and use. improvement in internal combustion engines.- having. two pistons within each e inder, namely a piston proper-and .nl piston. The invention is an imp on the invention shown and deer application filed by 'me December 1..

The suh-piston oft engine shown and descrihed in s: l pr 7 by. means. o a

interapplication is actu e mounted on a crankshaft on... with the rollon the lowerend of the sub-piston. The present in relates to the sub-piston stein.

The invention will" be fully unde from the following dez-scription when taken .in connection with the accompanying drawings, and the novel features thereof will. he pointed out and clearly defined in the claims at the close of this specification.

In the drawings Fig. 1 is a vertical cross stood section of a two-cycle internal combustion engine embodying the invention, showing the piston and sub-piston both at the top dead center. in the position. the end. of the compression stroke with the exhaust valve closed ready for the ignition.

Fig. 2 is a View showing the cam and the sub-piston stern in the position that they will occupy when within 4!" of the bottom dead center after hoth pistons have been driven down by the explosion and just before the main piston has descended e enough to open the intake port andjust before the sub-piston begin to rise for the suction and scavenging movement and just after the exhaust valve has been opened. F or the purpose of the present invention however, it is deemed necessary to show in this view only the sub-piston stem and the cam. i

F ig. 3 is a view of the sub-piston stem, the upper end of the stem heinr hroken away. 1

Referring now to the drawings 1 repre sents the cylinder and 2 the frame on which the cylinder is supported, and 3 the crank .11. i irronmsoN, a citizen of the United States. rem

shaft journalled in hearings carried by the 'The ejiliz 1:"1 l. is provided with an or; haust port 6 con- VVithin the at the suh- 1' connected that i t ure LV and or; right. that is in the opposite direct the direction of rotation of the earn.

the mm or a series of u if... extends toward tie .t e l'ol s or hall ij in line with ure 3. at the upper dead center. only the left-hand hall 1 :3, thatis the one at the heel of the sub-piston stem is in engagement with the canand this will be true during the time the the convex portion of the cam periphery is in engagement with. the suhpiston stein. Then, however, the ram revolves into the position shown in Figure 2 that the suh-piston stem in engagement with the drop, or reentrant portion. or incurve of the earn, the other balls on the arm 12 of the sub-piston stem will gradually be brought into engagement with the rain that when the cam turns into the position shown in Figure 52 within 45 of the bottom dead center and the substantia 57 straight portion a: of the cam 1% is in he izontal position. all of the balls 13 will simultaneously eng e the peripmjy of the cam.

In the form of suh-piston tein shown in the said-prior appl. .ion. derial No. 713, thesulrpiston stem nus straight. consisting only of the vertical portion of the sub-piston stein shown in. the present application and when the care was turning from the 5 position shown in Figure 2 of the present application where the left-hand hall-hearing engages the cam at the point 5 to the position where the point 0 at the the era nl:

aremhinted to euoi the rain. Ti lie.

other end oi the said llUl'lZUUti-Ll portion a in the periphery oi? the cam comes into engagement with the sub-piston stem, the

the use of the bent arm 1513 as shown in a the present application it will be seen that while the cam is in the position shown in Figure 2, a considerable extent of the cam surface is (it one time in engagement with the whole length oi the arm 12 or with the several ball-bearings distributed through the length of the arm 12": As the cam continues to turn from the'position shown in Figure 2 where the horizontal portion of the cam is in engagement with all of the halls the cam will at'first be in engagement with the right-hand ball only, the remaining halls being lifted out of engagement with the surface of the cam, then it will engage with the second ball from the right-hand end, and so on, passing from one to the other, engaging with one or two balls simultaneously until the high point of the cam is reached when it will then engage the left-hand ball only.

' What I claim is? 1. An internal combustion engine, having a cylinder, a main piston and a sub-piston movable in said cylinder a crank shaiit, a cam mounted on said crank shaft andv rotating therewith a stem connected with the sub-piston whose lower end engages with said cam, said lower end having an arm bent at a right angle to the main portion of the stem said cam being formed with a reentrant portion which atvcertain points in the rotation of the cam engages with the the said arm for substantially the full length of said arm' where it rides over a flat portion of the cam, and'as it rides over theconveX surface of the cam, the contacting portion gradually recedes to the heel of the arm. I

2. An internal combustion engine, having a cylinder, a main piston and a sub-piston movable in said cylinder, a crank shaft, a cam mounted on said crank shaft and rotating therewith, a stem connected with the sub-piston whose lower end engages with said cam, said lower end having an arm bent at a right angle to the main portion of the stem, said arm being provided with a series of ball-hearings which engage with the reentrant portion oi the cam at certain periods in the rotation of the cam for substantially the full length of said arm where it rides over a flat portion of the cam,

and as it rides over the convex surface of the cam, the contacting portion gradually recedes to the heel of the arm; t

In testimony whereof I affix my signature.

CARLETON H. HUTOHINS'ON. 

